Improvement in the construction of globes, maps



' configurations .ions-'on wirr muucnnnorr Annuaires Durme or MouuisANiA,

NEW YORK.

Letters Patent No. 109,581, diaet November 29,1870.

IMPROVEMENT IN THE CONSTRUCTION OF GLOBES, MAPS, &c., FOR SCHOOLS.

The Schedule referred to in these Letters 'Patent and making parl: of the same.

To all whom it may concern:

-Beit known that we, Jens Dn Wi'rr Benvenuti- HOFF and JAMEs DU'rHln, of Morris'ania, in` the county of Westchester and State of New York, have e inveuteda newand improved Method of Making forcing the material out of the orifice of the glasstube, retraeing those lines previously made. In this'manner all the lines that are required are ,raised on the surface of the globe.

This is then used as' a model, from which molds are Globes,4 Maps, land Charts; and we do vhereby declare l taken, which are employed to reproduce or multiply that the following is a full and exact description 'globes ina-uy 11u ber."

thereof, reference being had to the accompanying "lo complete a globe in this state for use, it is covspeeimen. ered with a preparation composed of Japan or boiled The nature 'oi' our invention consist-s in the construction of globes, maps and charts, with lines and inlaid in thesurface thereof, soA that fot erased in erasing drawings upon the or other suitable material, mixed with turpentiue or other` volatile iiuid, and tempered with flour of emcry, or other pulverous earthymatter, and colored with any dark-colored pigment, which, on the evaporation of the volatile portion, leaves the surface in y a condition to be written upon with a slate-pencil or other substance such as that. Lines so made can be erased.

oil,

the same aren surface thereof.'4 i.

'llo enablel'others skilled in the art to make and use our invention, we will proceed to describe the construction.

We construct a lines are then planed down to the sur- The "raised face, andthe result isa globe having a dark ground with white lines permanently inlaid or imbedded in its surface, and forming a constituent part of the body ofthe" globe itself, and which are incapable of erasure ji-wearing down by the friction i cideut to rubbing off the erasible lincs made by the pencil, as iu illus- Ytrating school lessons. Maps and charts-with a upon, and having thereon the outlines divisions of the earth, for the use of learners in Sec., are made by thc same process.

A white-surfaced globe with dark lines may be made by reversing the process? L,that is, by making the first surface and lines of a dark color, and the second in white. v

\Vhat we claim as our invention, and desire to secure by Letters Patent, is-

'lhe production of globes, maps, or charts having a surface with the configurationsv and lines inlaid or imbedded therein, by the process described or any other substantially the same.

- J Ol-[N DE lVl'lT BRINCKERHOFF.

JAMES DUTHE. Witnesses:

CnAUNonY SMITH, J Anus Molines.

globe hy iirstmaking a cage or skeleton ofwood, formed by a series of concentric rings, diminishing indiameter from the equator to the poles, which are covered with thin cliptical laths.

Through the center of thesevriugs is a shaft or axis, the ends supported by proper` hearings or boxes, in, such a manner that the whole maybe turned by'a `crank. v 4 v- A turn-plate of the required radius is leveled op'- positc the exact center of the shaft, and by turning the crank a, globe is struck corresponding to the size of the turn-plate by covering,l the aforesaid cage or skeleton with any plastic material suitable for the purpose. v

\Vhen dry and hard the surface is painted with several coatings of a mixture composed ot' ocher and Japan, and then rubbed smooth.

"he lines and configurations are then traced'in pencil, and afterward raised on the surface by Vusing a pen or pipett l made of a glass tube drawn to a point and terminating in a small orifice. To this is attached a gum tube with a mouth-piece;

',l`he glass `tube being filled with a plastic material ofthe proper consistence, as gellatine, or gum in solution mixed with zinc white, Paris white,.&c., it is held in the hand as a pen or pencil, the mouth isapplied to the gum tube, and the linesare raised by surface that may be drawn schools,

of' geographical 

